JP2009131111A - Motor actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor actuator which retains an engagement state of a worm gear with a worm wheel, even if deflection is caused in a rotating shaft. <P>SOLUTION: A regulating portion 52 provided in a case is constituted by a first regulating face 52a and a pair of second regulating faces 52b, 52c so that it surrounds the worm gear 41, in a dented manner at an opposite side of the worm wheel 44, wherein the first regulating face is positioned at the opposite side of the worm wheel 44 of the worm gear 41, and the second regulating faces are opposite to a direction of an axis M of the worm wheel 44. When deflection is caused in the rotating shaft (20), the regulating portion 52 regulates the movement of the worm gear 41 toward the opposite side of the worm wheel 44 by the first regulating face 52a, and regulates the movement of the worm gear 41, in a direction along the axis M of the worm wheel by each of the second regulating faces 52b, 52c, respectively, so that engagement of the worm gear 41 with the worm wheel 44 does not become disengaged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motor actuator for operating a blower path switching door in a vehicle air conditioner, for example.

Conventionally, in this type of motor actuator, for example, the one disclosed in Patent Document 1, a motor as a drive source, a worm gear provided so as to be coaxial with the rotation shaft of the motor, and a worm gear meshing with the worm gear A wheel is provided in the case, and the rotation of the rotation shaft is decelerated by the worm gear and the worm wheel and output.
JP-A-8-140306

  However, in the motor actuator as described above, the worm gear rotates while meshing with the worm wheel, and when the rotation is transmitted to the worm wheel, the reaction force from the worm wheel causes the rotation shaft to bend. Further, the meshing efficiency between the worm gear and the worm wheel is reduced by the bending, and there is a possibility that the meshing of the worm gear and the worm wheel is disengaged when the bending is increased.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor actuator capable of maintaining the meshed state of the worm gear and the worm wheel even when the rotation shaft is bent. It is in.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a motor as a drive source, a worm gear provided so as to be coaxial with the rotation shaft of the motor, and a worm wheel meshing with the worm gear. A motor actuator provided in a case and decelerating and outputting the rotation of the rotary shaft by the worm gear and the worm wheel, the case including a first regulating surface located on the side of the worm gear opposite to the worm wheel; In the case where a restricting portion configured to be recessed toward the anti-worm wheel so as to surround the worm gear from a pair of second restricting surfaces opposed to each other in the axial direction of the worm wheel is provided, and the rotating shaft is not bent. , Each regulating surface of the regulating part is not in contact with the worm gear, and when the rotating shaft is bent, the regulating surface The worm gear and the worm wheel are moved so that the worm gear moves to the side opposite to the worm wheel at the first restriction surface, and the worm gear axis line of the worm gear is moved at the second restriction surface. The gist is to regulate each movement in the direction along.

  In the present invention, the anti-worm is provided so that the restricting portion provided on the case surrounds the worm gear from the first restricting surface located on the anti-worm wheel side of the worm gear and the pair of second restricting surfaces opposed in the axial direction of the worm wheel. Concave on the wheel side. When the rotation shaft is bent, the restricting portion moves the worm gear to the side opposite to the worm wheel on the first restricting surface so that the engagement between the worm gear and the worm wheel is not released. The movement of the worm gear in the direction along the worm wheel axis is restricted respectively. Therefore, when the rotation of the worm gear is transmitted to the worm wheel, the worm gear does not leave the worm wheel even if the rotation shaft is bent due to the reaction force from the worm wheel. Can be held.

  According to a second aspect of the present invention, in the motor actuator according to the first aspect, each second restriction surface of the restriction portion has an axis line of the worm gear within the tooth width of the worm wheel in the axial direction of the worm wheel. The gist is to restrict the movement of the worm gear in the direction along the worm wheel axis so that the worm gear is always positioned.

  In the present invention, each second restricting surface of the restricting portion restricts movement of the worm gear in the direction along the worm wheel axis line so that the worm gear axis line is always positioned within the tooth width of the worm wheel in the worm wheel axial direction. To do. Therefore, the movement of the worm gear in the direction along the worm wheel axis line can be restricted so that the meshing efficiency between the worm gear and the worm wheel is maintained within an appropriate range. It can hold | maintain more suitably.

The invention according to claim 3 is the motor actuator according to claim 1 or 2, wherein the restricting portion is formed on a side wall of the case.
In the present invention, since the restricting portion is formed on the side wall of the case, it can be configured without increasing the number of members, and can contribute to the miniaturization of the motor actuator.

  According to a fourth aspect of the present invention, in the motor actuator according to the third aspect, the case is formed by assembling first and second case members separated in the axial direction of the worm wheel. The gist is that the restriction portion is configured by assembling the second case member.

  In this invention, the case is constructed by assembling the first and second case members separated in the axial direction of the worm wheel, and the restricting portion is configured by assembling the first and second case members. The restricting portion can be easily formed on the side wall of the case.

  According to a fifth aspect of the present invention, in the motor actuator according to the fourth aspect, one of the second restriction surfaces of the restriction portion and the first restriction surface that forms a plane along the axis of the worm wheel are the first. The gist of the invention is that it is formed on one case member and the other of the second restricting surfaces is formed on the second case member.

  In the present invention, one of the second restriction surfaces of the restriction portion and the first restriction surface forming a plane along the axial direction of the worm wheel are formed on the first case member, and the other of the second restriction surfaces is the second case member. Therefore, the restricting portion can be easily formed by the side wall of the case. Moreover, it can comprise so that a worm gear may not contact the contact part of the 1st case member and 2nd case member in a control part.

  According to a sixth aspect of the present invention, in the motor actuator according to any one of the first to fourth aspects, the first restricting surface of the restricting portion is a straight line orthogonal to the axes of the worm gear and the worm wheel. The gist is that it is formed in an arc shape centered on one point.

  In this invention, the 1st control surface of a control part is formed in the circular arc shape centering on one point on the straight line orthogonal to each axis of a worm gear and a worm wheel. For this reason, even if the worm gear comes into contact with the first restricting surface due to the deflection of the rotating shaft and moves following the first restricting surface, the meshing state (meshing depth) between the worm gear and the worm wheel is kept substantially constant. Therefore, the meshing efficiency between the worm gear and the worm wheel can be suitably maintained.

  Therefore, according to the above described invention, the meshed state of the worm gear and the worm wheel can be maintained even if the rotation shaft is bent.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a vehicle air conditioner using a motor actuator according to the present invention. As shown in FIG. 1, the vehicle air conditioner includes a blower fan 4, an evaporator 5, a heater core 6, and air blown in the air conditioning duct 3 in an air conditioning duct 3 having an outside air introduction path 1 and an inside air circulation path 2. Various switching doors 7 for switching passages and a plurality of motor actuators 8 for operating the various switching doors 7 are provided.

  The air conditioning duct 3 is provided with an outside air introduction path 1 and an inside air circulation path 2 symmetrically on the inlet side as an air suction path, and a blower fan 4 driven by a motor 4a is provided near the inlet, immediately downstream thereof. Is provided with an evaporator 5. Further, on the further downstream side, a heater core 6 is provided so as to close almost half of the cross section of the duct 3. The downstream of the heater core 6 is divided into three branch ducts 3a, 3b, 3c. The inlet part has an R / F door 7a for switching between outside air intake and inside air circulation, the heater core 6 part has an air mix door 7b for opening and closing the remaining duct cross section, and further each branch part of the branch ducts 3a to 3c. Each is provided with a mode switching door 7c. These various switching doors 7 are respectively provided with corresponding motor actuators 8 having the same configuration, and the various switching doors 7 are operated by rotation of the output shaft 8a.

  Next, the motor actuator 8 that drives the various switching doors 7 will be described with reference to FIGS. As shown in FIG. 2A, the first case member 10 of the motor actuator 8 has a cup shape from a bottom portion 10a and a side wall 10b extending orthogonally from an outer peripheral end portion of the bottom portion 10a. A flat box-like case is configured by assembling the first case member 10 so that a second case member having a cup shape covers the opening of the first case member 10, and a brushless case is formed inside the case. The motor 11 and the speed reduction mechanism 12 are accommodated in a drivingly connected state. In FIG. 2, for convenience of explanation, the second case member is omitted so that the internal configuration can be seen, and the brushless motor 11 is shown in cross section.

  The center piece 13 for supporting the brushless motor 11 with respect to the case is provided with a hook-like fixing portion 14 at the base end portion, and the fixing portion 14 is formed on the bottom portion 10 a of the first case member 10. Held by the holding portion 10c. In addition, this holding | maintenance part 10c is clamping the fixing | fixed part 14 in the assembly | attachment direction (paper surface orthogonal direction in FIG. 2) with the holding | maintenance part (not shown) formed in the said 2nd case member.

  The center piece 13 is formed with a substantially cylindrical boss 15 extending from the center of the fixed portion 14 toward the tip of the brushless motor 11. The boss portion 15 opens toward the distal end side of the brushless motor 11, and two metal bearings 21 that respectively support the proximal end portion and the longitudinal intermediate portion of the rotating shaft 20 are held therein. The rotary shaft 20 is supported so that its axis L is parallel to the flat surface (bottom 10a) of the case. Further, an armature core 22 around which a coil (not shown) for generating a rotating magnetic field is wound is fixed to the outer peripheral surface of the boss portion 15. The armature core 22 is provided with a power feeding terminal 23 electrically connected to the coil.

  A yoke 24 having a bottomed cylindrical shape that opens to the proximal end side of the brushless motor 11 is fixed to the distal end side of the boss portion 15 of the rotating shaft 20 at the center of the bottom portion. A side wall of the yoke 24 extends in the direction of the axis L so as to cover the armature core 22, and a magnet 25 in which N poles and S poles are alternately magnetized in the circumferential direction on the inner peripheral surface of the side walls. It is fixed so as to face the armature core 22. The magnet 25, the yoke 24, and the rotating shaft 20 rotate integrally when a rotating magnetic field generated by the coil of the armature core 22 acts on the magnet 25.

  A substrate 31 electrically connected to the terminal 23 is fixed to the boss 15 so as to be orthogonal to the axis L between the yoke 24 and the fixed portion 14. Three Hall elements 32 as detection elements are disposed on the surface of the substrate 31 facing the magnet 25 (only one is shown in FIG. 2A). Each Hall element 32 is provided at a predetermined position facing the magnet 25 in the direction of the axis L, detects a change in the magnetic field accompanying the rotation of the magnet 25, and outputs an output signal corresponding to the change in the magnetic field.

  A connector member 33 fitted to the side wall 10 b of the first case member 10 is fixed to the back surface of the substrate 31. The connector member 33 is for connecting to an external connector (not shown), and the connector member 33 is electrically connected to the substrate 31 through connection terminals 33a. Further, a drive control IC (not shown) electrically connected to the connector member 33 and a plurality of electric circuit components (a plurality of capacitors, choke coils, oscillators for LIN communication, etc.) are mounted on the substrate 31. The drive control IC supplies a drive current to the coil based on detection signals from the hall elements 32 to rotate the brushless motor 11.

  In such a brushless motor 11, a worm gear 41 having a worm formed on the outer peripheral portion is inserted and fixed so as to be coaxial with the rotary shaft 20 at the tip of the rotary shaft 20. A thrust receiving ball 42 (hereinafter simply referred to as a ball 42) for receiving a thrust load is provided at the tip of the worm gear 41. In the vicinity of the worm gear 41, the worm gear 41 meshes with the bottom portion 10a of the first case member 10 and the support shaft 43 held at both ends by the second case member so as to be orthogonal to the flat surface (bottom portion 10a) of the case. The worm wheel 44 is rotatably supported. The worm wheel 44 meshes with the worm gear 41 at the center of the tooth width B in the axis M direction (see FIG. 4). A small diameter gear 44 a having a smaller diameter than that of the wheel 44 is integrally formed on an end surface of the worm wheel 44 facing the bottom portion 10 a. An intermediate gear 45 rotatably supported by the case is meshed with the small-diameter gear 44a, and an output gear 46 that is also rotatably supported by the case is drivingly connected to the intermediate gear 45. The intermediate gear 45 and the output gear 46 are provided such that their rotational axes are parallel to the axis M of the worm wheel 44.

  The speed reduction mechanism 12 is constituted by the worm gear 41, the worm wheel 44, the intermediate gear 45, and the output gear 46 as described above. The rotation of the brushless motor 11 is decelerated by the speed reduction mechanism 12 and transmitted to the output shaft 8 a formed at the center of the output gear 46. The various switching doors 7 are actuated by the rotation of the output shaft 8a by the transmitted driving force.

[Worm gear movement restriction structure]
As shown in FIG. 2B, the worm gear 41 includes a worm portion 41a that meshes with the worm wheel 44, and a cylindrical protruding portion 41b that protrudes in the direction of the axis L from the tip of the worm portion 41a. The protruding portion 41b is formed with a smaller diameter than the worm portion 41a. The ball 42 is fitted to the tip of the protruding portion 41 b so as to partially protrude, and the protruding portion of the ball 42 can contact the thrust receiving groove 51 formed on the side wall 10 b of the first case member 10. It has become. The thrust receiving groove 51 extends in a direction perpendicular to the flat surface (bottom portion 10a) of the case so as to form a V shape in a plan view, and comes into contact with the ball 42 on each surface forming the V shape. As a result, the thrust receiving groove 51 receives a force in the thrust direction from the worm gear 41 during rotation, and suppresses movement of the worm gear 41 in the radial direction (a direction orthogonal to the extending direction of the thrust receiving groove 51). It has become.

  Further, as shown in FIGS. 3 and 4, the case includes a first restriction surface 52 a located on the side of the worm gear 41 on the side opposite to the worm wheel 44, and a pair of second restriction surfaces opposed to the axis M direction of the worm wheel 44. A restricting portion 52 having a U-shaped cross section from 52 b and 52 c is formed so as to surround the worm gear 41. More specifically, one of the first restriction surface 52 a and the pair of second restriction surfaces (second restriction surface 52 b) is formed on the side wall 10 b of the first case member 10 so as to be continuously connected to the thrust receiving groove 51. The other of the pair of second restriction surfaces (second restriction surface 52 c) is formed on the side wall 53 a of the second case member 53. That is, the restricting portion 52 is formed across the side walls 10 b and 53 a of the first case member 10 and the second case member 53, and the restriction is achieved by assembling the first case member 10 and the second case member 53. The part 52 is configured.

  As shown in FIG. 4, the first restriction surface 52 a of the restriction portion 52 is a plane along the axis M of the worm wheel 44, and the second restriction surface 52 b on the first case member 10 side is the lower side (bottom portion) of the worm gear 41. 10a side), a plane extending orthogonally from the first restriction surface 52a is formed. Further, the second restricting surface 52c on the second case member 53 side forms a plane parallel to the second restricting surface 52b on the first case member 10 side. Each of the regulating surfaces 52a to 52c is opposed to the outer peripheral surface of the protruding portion 41b of the worm gear 41 in a non-contact manner in a normal state (a state where the rotating shaft 20 is not bent). In this normal state, the worm gear 41 is disposed in the center of the restricting portion 52 in the direction of the axis M, and the distance between the protruding portion 41b of the worm gear 41 and the first restricting surface 52a is set so as not to contact each other. Each of the second restricting surfaces 52 b and 52 c can always maintain the axis L of the worm gear 41 within the tooth width B of the worm wheel 44 even if the worm gear 41 moves in the direction of the axis M of the worm wheel 44. In the position.

Next, the operation of the worm gear movement restriction structure as described above will be described.
When the brushless motor 11 is driven, the worm gear 41 rotates while meshing with the worm wheel 44, and the rotational force is transmitted to the worm wheel 44. During the transmission, if the rotary shaft 20 bends due to the reaction force from the worm wheel 44, the worm gear 41 is separated from the worm wheel 44, the direction along the axis M of the worm wheel 44, and the combined direction thereof. Move to. At this time, the movement of the worm gear 41 toward the anti-worm wheel 44 is restricted by the first restriction surface 52a, and the movement in the direction along the worm wheel axis M is restricted by the second restriction surfaces 52b and 52c. Therefore, the worm gear 41 is not separated from the worm wheel 44. In FIG. 4, as an example, a state in which the worm gear 41 is in contact with the first restriction surface 52a and the second restriction surface 52b on the first case member 10 side is indicated by a two-dot chain line.

  Each of the second restricting surfaces 52b and 52c is along the worm wheel axis M of the worm gear 41 so that the axis L of the worm gear 41 is always located within the tooth width B of the worm wheel 44 in the direction of the axis M of the worm wheel 44. Restrict movement in the direction. For this reason, the movement of the worm gear 41 is restricted so that the meshing efficiency between the worm gear 41 and the worm wheel 44 is maintained within an appropriate range, and the meshed state is suitably maintained.

Next, characteristic effects of the present embodiment will be described.
(1) In the present embodiment, the restricting portion 52 provided in the case has a pair of second restricting surfaces facing the first restricting surface 52a located on the side of the worm wheel 41 opposite to the worm wheel 44 and the axis M of the worm wheel 44. The surface 52b, 52c is configured to be recessed toward the anti-worm wheel 44 so as to surround the worm gear 41. Then, when the rotating shaft 20 is bent, the restricting portion 52 moves the worm gear 41 to the anti-worm wheel 44 side at the first restricting surface 52a so that the engagement between the worm gear 41 and the worm wheel 44 is not released. The second restriction surfaces 52b and 52c restrict the movement of the worm gear 41 in the direction along the worm wheel axis M, respectively. Therefore, when the rotation of the worm gear 41 is transmitted to the worm wheel 44, the worm gear 41 is not detached from the worm wheel 44 even if the rotating shaft 20 is bent due to the reaction force from the worm wheel 44. The state can be maintained.

  (2) In the present embodiment, the second restricting surfaces 52 b and 52 c are arranged so that the axis L of the worm gear 41 is always located within the tooth width B of the worm wheel 44 in the direction of the axis M of the worm wheel 44. The movement in the direction along the worm wheel axis M is restricted. Therefore, the movement of the worm gear 41 in the direction along the worm wheel axis M can be restricted so that the meshing efficiency between the worm gear 41 and the worm wheel 44 is maintained within an appropriate range. It can hold | maintain more suitably.

  (3) In the present embodiment, since the restricting portion 52 is formed on the side wall (each side wall 10b, 53a) of the case, it can be configured without increasing the number of members and can contribute to the miniaturization of the motor actuator 8. .

  (4) In this embodiment, the case is formed by assembling the first and second case members 10 and 53 separated in the direction of the axis M of the worm wheel 44, and the first and second case members 10 and 53 are assembled. Since the restricting portion 52 is configured by being assembled, the restricting portion 52 can be easily formed on the side wall of the case.

  (5) In the present embodiment, one of the second restriction surfaces (second restriction surface 52b) of the restriction portion 52 and the first restriction surface 52a forming a plane along the axis M direction of the worm wheel 44 are the first case member. 10 and the other of the second restriction surfaces (second restriction surface 52c) is formed on the second case member 53, the restriction portion 52 can be easily formed by the side wall of the case. Further, the worm gear 41 can be configured not to contact the contact portion between the first case member 10 and the second case member 53 in the restricting portion 52.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the first restricting surface 52a is a flat surface along the axis M of the worm wheel 44. However, for example, it may be a first restricting surface 60 having an arc shape as shown in FIG. The first restricting surface 60 is centered on one point on a straight line N orthogonal to the axis lines L and M of the worm gear 41 and the worm wheel 44, more specifically on an intersection point P between the straight line N and the axis line M of the worm wheel 44. It is formed in an arc shape. The first restriction surface 60 is formed across the side walls 10b and 53a of the first and second case members 10 and 53, and the first restriction surface 60 and the protruding portion 41b of the worm gear 41 do not contact in a normal state. They are arranged at intervals. According to such a configuration, even if the worm gear 41 contacts the arc-shaped first restricting surface 60 as described above due to the bending of the rotating shaft 20 and moves along the first restricting surface 60, the worm gear 41 and the worm gear 41 The meshing state (meshing depth) with the wheel 44 is kept substantially constant. Therefore, the meshing efficiency between the worm gear 41 and the worm wheel 44 can be suitably maintained. Although the first restricting surface 60 is formed in an arc shape centered on the intersection point P on the straight line N, the first restricting surface 60 may be formed in an arc shape centered on a point different from the intersection point P on the straight line N.

  In the above embodiment, the protruding portion 41b formed on the worm gear 41 is configured to come into contact with the restricting portion 52. However, the present invention is not particularly limited to this, and for example, the tip of the rotating shaft 20 protrudes. In this way, a cylindrical worm gear may be provided so that the protruding end of the rotating shaft 20 and the restricting portion 52 come into contact with each other.

  In the above embodiment, the first restriction surface 52a is formed on the side wall 10b of the first case member 10, but it may be formed on the side wall 53a of the second case member 53, and straddles the side walls 10b and 53a. May be formed.

In the above embodiment, the ball 42 is fitted to the tip of the protrusion 41b of the worm gear 41, but a hemisphere may be integrally formed at the tip of the protrusion 41b.
In the above embodiment, the worm gear 41 may be press-fitted into the rotating shaft 20 or integrally formed. In these cases, the ball 42 and the hemisphere may not be provided.

In the above embodiment, the thrust receiving groove 51 is formed in a V shape, but is not particularly limited thereto, and may be formed in a planar shape orthogonal to the axis L, for example.
In the above embodiment, the thrust receiving groove 51 and the restricting portion 52 are formed on the side walls (side walls 10b and 53a) of the case, but they may be separated from the case and assembled to the case.

In the above embodiment, the brushless motor 11 is supported by so-called cantilever support in which only the base end portion is supported. However, for example, a configuration in which the brushless motor 11 is supported by both ends may be employed.
In the above embodiment, the outer rotor type brushless motor 11 is used. However, for example, a brush motor or a stepping motor may be used. Further, it may be an inner rotor type motor.

  In the above embodiment, the vehicle air conditioner has been described as an example. However, the motor actuator 8 may be used for devices other than the vehicle air conditioner, such as a vehicle headlamp control system (Adaptive Front Lighting System).

The schematic block diagram of the vehicle air conditioner using the motor actuator of this embodiment. (A) The top view which shows a motor actuator, (b) The top view near worm-gear front-end | tip. The perspective view which shows the control part of a case side wall. The schematic diagram which shows the axis orthogonal cross section of worm gear tip vicinity. The schematic diagram which shows the axis orthogonal cross section of the worm gear tip vicinity in another example.

Explanation of symbols

  B: Worm wheel tooth width, L: Worm gear axis (rotating shaft) axis, M: Worm wheel axis, N: Straight line orthogonal to the rotating shaft and worm wheel axis, P: Worm gear and worm wheel axis One point (intersection) on an orthogonal straight line, 8 ... motor actuator, 10 ... first case member, 10b ... side wall of the first case member, 11 ... brushless motor, 20 ... rotary shaft, 41 ... worm gear, 44 ... worm wheel, 52 ... Restriction part, 52a, 60 ... 1st restriction surface, 52b, 52c ... A pair of 2nd restriction surface, 53 ... 2nd case member, 53a ... Side wall of 2nd case member.

Claims (6)

A motor as a drive source, a worm gear provided so as to be coaxial with the rotation shaft of the motor, and a worm wheel meshing with the worm gear are provided in the case, and the rotation of the rotation shaft is performed by the worm gear and the worm wheel. A motor actuator that decelerates and outputs at
The case is recessed toward the anti-worm wheel side so as to surround the worm gear from a first restriction surface located on the anti-worm wheel side of the worm gear and a pair of second restriction surfaces opposed in the axial direction of the worm wheel. A configured regulation part is provided,
In the case where no deflection occurs in the rotating shaft, each regulating surface of the regulating part is not in contact with the worm gear,
In the case where the rotation shaft is bent, the restricting portion moves the worm gear toward the anti-worm wheel on the first restricting surface so that the engagement between the worm gear and the worm wheel is not released. A motor actuator characterized in that movement of the worm gear in a direction along the worm wheel axis is regulated by each second regulating surface. The motor actuator according to claim 1, wherein
Each second restricting surface of the restricting portion moves in the direction along the worm wheel axis so that the axis of the worm gear is always located within the tooth width of the worm wheel in the axial direction of the worm wheel. A motor actuator characterized by restricting the motor. The motor actuator according to claim 1 or 2,
The motor actuator according to claim 1, wherein the restricting portion is formed on a side wall of the case. The motor actuator according to claim 3, wherein
The case is formed by assembling first and second case members separated in the axial direction of the worm wheel, and the restricting portion is configured by assembling the first and second case members. Motor actuator. The motor actuator according to claim 4, wherein
One of the second restriction surfaces of the restriction portion and the first restriction surface forming a plane along the axis of the worm wheel are formed on the first case member, and the other of the second restriction surfaces is the second case member. A motor actuator characterized in that it is formed. The motor actuator according to any one of claims 1 to 4,
The motor actuator according to claim 1, wherein the first restricting surface of the restricting portion is formed in an arc shape centered on one point on a straight line orthogonal to each axis of the worm gear and the worm wheel.

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